diff --git a/packages/fluxent/models/transaction.py b/packages/fluxent/models/transaction.py
index 3ad4eb7..1b1136e 100644
--- a/packages/fluxent/models/transaction.py
+++ b/packages/fluxent/models/transaction.py
@@ -1,7 +1,7 @@
 from datetime import UTC, datetime
 from decimal import Decimal
 from enum import StrEnum
-from typing import Annotated, Self
+from typing import Annotated, Literal, Self
 
 from pydantic import BaseModel, Field, model_validator
 from pydantic_extra_types.country import CountryAlpha2
@@ -128,33 +128,35 @@ class BaseTransaction(BaseModel):
 class MiscInTransaction(BaseTransaction):
     """其他收入交易"""
 
-    txn_scene = "MISC_IN"
+    txn_scene: Annotated[Literal["MISC_IN"], "交易场景"] = "MISC_IN"
+    dc_flag: Annotated[DcFlag, "借贷方向"] = DcFlag.CREDIT
 
 
 class MiscOutTransaction(BaseTransaction):
     """其他支出交易"""
 
-    txn_scene = "MISC_OUT"
+    txn_scene: Annotated[Literal["MISC_OUT"], "交易场景"] = "MISC_OUT"
+    dc_flag: Annotated[DcFlag, "借贷方向"] = DcFlag.DEBIT
 
 
 class PaymentTransaction(MiscOutTransaction):
     """支付交易"""
 
-    txn_scene = "PAYMENT"
+    txn_scene: Annotated[Literal["PAYMENT"], "交易场景"] = "PAYMENT"
     merchant_name: Annotated[str | None, "商户名称", Field(default=None)]
 
 
 class EcomPaymentTransaction(PaymentTransaction):
     """电子商务支付交易"""
 
-    txn_scene = "ECOM_PAYMENT"
+    txn_scene: Annotated[Literal["ECOM_PAYMENT"], "交易场景"] = "ECOM_PAYMENT"
     order_id: Annotated[str | None, "订单ID", Field(default=None)]
 
 
 class PosPaymentTransaction(PaymentTransaction):
     """POS支付交易"""
 
-    txn_scene = "POS_PAYMENT"
+    txn_scene: Annotated[Literal["POS_PAYMENT"], "交易场景"] = "POS_PAYMENT"
     geo: Annotated[
         tuple[CountryAlpha2] | tuple[CountryAlpha2, str] | None, "地理信息", Field(default=None)
     ]
@@ -163,7 +165,7 @@ class PosPaymentTransaction(PaymentTransaction):
 class ATMTransaction(BaseTransaction):
     """ATM交易"""
 
-    txn_scene = "ATM"
+    txn_scene: Annotated[Literal["ATM"], "交易场景"] = "ATM"
     geo: Annotated[
         tuple[CountryAlpha2] | tuple[CountryAlpha2, str] | None, "地理信息", Field(default=None)
     ]
@@ -172,7 +174,7 @@ class ATMTransaction(BaseTransaction):
 class TransferTransaction(BaseTransaction):
     """转账交易"""
 
-    txn_scene = "TRANSFER"
+    txn_scene: Annotated[Literal["TRANSFER"], "交易场景"] = "TRANSFER"
 
 
 type Transaction = Annotated[